Abstract：Long chain fatty acids (LCFAs) affect the stability of anaerobic digestion system. The methanogenic properties of 3typical LCFAs (palmitate C16:0, stearate C18:0, oleate C18:1) at different concentrations and their effects on anaerobic digestion were studied. The methanogenic results showed that the complete degradation of oleate was significantly slower (26d), but the specific methanogenic activity (SMA) was higher, which was 1.2 and 2.7 times that of palmitate and stearate. The lag time (t0) and the maximum methane production rate (Rmax) of the oleate group increased linearly with the rising of the concentration. Thus it can be seen that the influence of saturation degree on the degradation kinetics of LCFAs was greater than the carbon chain length. Microbial community analysis showed that the abundance of Clostridium_sensu_stricto and Petrimonas in the oleate group was higher (10.38% and 10.03%). This may be due to the polyhydroxyl LCFAs produced by saturation before β-oxidation, which degrade more slowly. The addition of oleate also enriched Methanosarcina, Methanosobacterium and Methanomassiliicoccus, strengthening the hydrogenotrophic methanogenesis pathway. In addition, the 3LCFAs had inhibitory effects on each stage of anaerobic digestion. The inhibitory degree was the strongest on methanogenesis (16.51%, 40.49%, 63.77%, respectively), and was affected by both the carbon chain length and saturation degree.
席钰, 鲁斌, 陈豪, 张孟娜, 李倩. LCFAs降解动力学特性及对厌氧消化各阶段的影响[J]. 中国环境科学, 2023, 43(8): 4080-4088.
XI Yu, LU Bin, CHEN Hao, ZHANG Meng-na, LI Qian. Degradation kinetics of LCFAs and effects on anaerobic digestion. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4080-4088.
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